好吧,伙计们,抱歉这个问题,因为我知道有几个已经有关于编写的Typescript,但我遇到了这个问题,我无法连接点.
我正在尝试按照Angular2 Tour of Heroes应用程序,并尝试用the chapter on Http完成它,但我的hero.service.ts文件输出此错误：
error TS2339: Property 'handleError' does not exist on type 'HeroService'
我从这里的其他问题中了解到,这很可能与Typescript的配置方式有关,但似乎没有这个问题的一致原因.
我不熟悉Typescript(或Angular2)的特性来解决我自己的问题.
我现在的代码如下所示：
码：
import { Injectable } from '@angular/core';
import { Headers,Http } from '@angular/http';
import 'rxjs/add/operator/toPromise';
import { Hero } from './hero';
@Injectable()
export class HeroService {
private heroesUrl: 'app/heroes'; //URL to web api
constructor(private http: Http) { }
getHeroes(): Promise<Hero[]> {
return this.http.get(this.heroesUrl)
.toPromise()
.then(response => response.json().data as Hero[])
.catch(this.handleError);
}
getHeroesSlowly(): Promise<Hero[]> {
return new Promise<Hero[]>(resolve =>
setTimeout(resolve,2000))
.then(() => this.getHeroes());
}
getHero(id: number): Promise<Hero> {
return this.getHeroes()
.then(heroes => heroes.find(hero => hero.id === id));
}
}
我有点困惑的是,错误消息说它无法在’HeroService’上找到属性,这是在程序中创建的类,而不是Typescript本身的一部分.
我的systemjs.config.js文件如下所示：
SYSTEMJS.CONFIG：
/**
* System configuration for Angular 2 samples
* Adjust as necessary for your application needs.
*/
(function (global) {
System.config({
paths: {
// paths serve as alias
'npm:': 'node_modules/'
},// map tells the System loader where to look for things
map: {
// our app is within the app folder
app: 'app',// angular bundles
'@angular/core': 'npm:@angular/core/bundles/core.umd.js','@angular/common': 'npm:@angular/common/bundles/common.umd.js','@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js','@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js','@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js','@angular/http': 'npm:@angular/http/bundles/http.umd.js','@angular/router': 'npm:@angular/router/bundles/router.umd.js','@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',// other libraries
'rxjs': 'npm:rxjs','angular2-in-memory-web-api': 'npm:angular2-in-memory-web-api',},// packages tells the System loader how to load when no filename and/or no extension
packages: {
app: {
main: './main.js',defaultExtension: 'js'
},rxjs: {
defaultExtension: 'js'
},'angular2-in-memory-web-api': {
main: './index.js',defaultExtension: 'js'
}
}
});
})(this);
我的package.json文件如下所示：
的package.json：
{
"name": "angular2-quickstart","version": "1.0.0","scripts": {
"start": "tsc && concurrently \"npm run tsc:w\" \"npm run lite\" ","lite": "lite-server","postinstall": "typings install","tsc": "tsc","tsc:w": "tsc -w","typings": "typings"
},"license": "ISC","dependencies": {
"@angular/common": "2.0.0","@angular/compiler": "2.0.0","@angular/core": "2.0.0","@angular/forms": "2.0.0","@angular/http": "2.0.0","@angular/platform-browser": "2.0.0","@angular/platform-browser-dynamic": "2.0.0","@angular/router": "3.0.0","@angular/upgrade": "2.0.0","core-js": "^2.4.1","reflect-Metadata": "^0.1.3","rxjs": "5.0.0-beta.12","systemjs": "0.19.27","zone.js": "^0.6.23","angular2-in-memory-web-api": "0.0.20","bootstrap": "^3.3.6"
},"devDependencies": {
"concurrently": "^2.2.0","lite-server": "^2.2.2","typescript": "^2.0.2","typings":"^1.3.2"
}
}
如果这个问题与这个问题的其他一些版本重复,那么我没有看到这些问题随意引导我.
谢谢.
